Acquisitions - Additional Information (Details)		3 Months Ended	12 Months Ended
	Jan. 23, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2017 CAD / shares
Business Acquisition [Line Items]
Cash paid, net of cash acquired			$ 57,700,000	$ 0	$ 0
Excess purchase price allocated to Goodwill		$ 2,956,100,000	2,956,100,000	$ 2,888,400,000	$ 3,013,700,000
Earnings Based Metrics
Business Acquisition [Line Items]
Maximum contingent consideration payout		38,500,000.0	38,500,000.0
Goodwill deductible for income tax purposes		0	0
Aggregate total
Business Acquisition [Line Items]
Total Consideration			66,000,000
Cash paid, net of cash acquired			57,700,000
Contingent Consideration		7,500,000	7,500,000
Allocation of purchase price to Intangible assets, net		56,400,000	$ 56,400,000
Weighted average useful life of acquired intangible assets			8 years 3 months 18 days
Excess purchase price allocated to Goodwill		14,600,000	$ 14,600,000
NYX Gaming Group Limited
Business Acquisition [Line Items]
Acquisition price (in dollars per share) | CAD / shares						CAD 2.40
Fair value of shares acquired		91,900,000
Cash paid in acquisition		$ 665,800,000
Non-controlling interest acquired		36.00%	36.00%
Tech Art | Subsequent event
Business Acquisition [Line Items]
Total Consideration	$ 9,600,000
Minimum
Business Acquisition [Line Items]
Discount rate			9.00%
Royalty rate			1.00%
Maximum
Business Acquisition [Line Items]
Discount rate			20.00%
Royalty rate			16.00%